I use my Hornady Ultrasonic cleaner when shooting the bptr national match or some other when it's a long day shooting, lots of empties and a person doesn't really feel like messing with the thumblers.
I deprime the brass, put it in a coffee can and drop a scoop of Oxyclean in then wash and rinse, then from the can to the ultra sonic using Hornady's cleaning solution. Run two of the 8 minute cycles, rinse it and dry. It's good to go when it dried. Not quite as shiny as a couple of hours in the thumblers with ceramic media.
I've also done the same process with some knarly looking old used smokeless brass. The Oxyclean knocks a lot of the crud loose and the ultra sonic seperates it, from the brass. I do find by using hot water in the ultra sonic the brass will be a bit shinier.